We took a snapshot look at flights to those 15 cities, comparing the Southwest round-trip fare to a fare for a similar flight on American Airlines (you know, that other giant airline based here), for an average savings of $113.73 per flight. As of right now, American hasn't dropped prices on flights to most of these cities. But keep in mind, American could change that at any moment. This Southwest fare sale expires on May 23.

On each flight, we chose the least expensive nonstop option available, regardless of time of day. To these cities, we searched flights departing Oct. 17, returning Sunday, Oct. 19.

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